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Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.04 / 25.10 : Intel Microcode vulnerabilities (USN-7866-1)

high Nessus Plugin ID 274751

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.04 / 25.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7866-1 advisory.

 Barak Gross discovered that some Intel Xeon processors with SGX enabled did not properly handle buffer restrictions. A local authenticated user could potentially use this issue to escalate their privileges.
 (CVE-2025-20053)

 Avinash Maddy discovered that some Intel processors did not properly isolate or compartmentalize the stream cache mechanisms. A local authenticated user could potentially use this issue to escalate their privileges. (CVE-2025-20109)

 Joseph Nuzman discovered that some Intel Xeon processors did not properly manage references to active allocate resources. A local authenticated user could potentially use this issue to cause a denial of service (system crash). (CVE-2025-21090)

 It was discovered that some Intel Xeon 6 processors did not properly provide sufficient granularity of access control in the out of band management service module (OOB-MSM). An authenticated user could potentially use this issue to escalate their privileges. (CVE-2025-22839)

 It was discovered that some Intel Xeon 6 Scalable processors did not properly handle a specific sequence of processor instructions, leading to unexpected behavior. A local authenticated user could potentially use this issue to escalate their privileges. (CVE-2025-22840)

 Joseph Nuzman discovered that some Intel Xeon 6 processors with Intel Trust Domain Extensions (Intel TDX) did not properly handle overlap between protected memory ranges. A local authenticated user could potentially use this issue to escalate their privileges. (CVE-2025-22889)

 Avraham Shalev discovered that some Intel Xeon processors did not properly provide sufficient control flow management in the Alias Checking Trusted Module (ACTM) firmware. A local authenticated user could potentially use this issue to escalate their privileges. (CVE-2025-24305)

 Aviv Eisen and Avraham Shalev discovered that some Intel Xeon 6 processors when using Intel SGX or Intel TDX did not properly protect against out-of-bounds writes in the memory subsystem. A local authenticated user could potentially use this issue to escalate their privileges. (CVE-2025-26403)

 Aviv Eisen and Avraham Shalev discovered that some Intel Xeon 6 processors when using Intel SGX or Intel TDX did not properly implement security checks in the DDRIO configuration. A local authenticated user could potentially use this issue to escalate their privileges. (CVE-2025-32086)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected intel-microcode package.

See Also

https://ubuntu.com/security/notices/USN-7866-1

Plugin Details

Severity: High

ID: 274751

File Name: ubuntu_USN-7866-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 11/11/2025

Updated: 11/11/2025

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6

Temporal Score: 4.4

Vector: CVSS2#AV:L/AC:H/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2025-20109

CVSS v3

Risk Factor: High

Base Score: 7.9

Temporal Score: 6.9

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2025-22889

CVSS v4

Risk Factor: High

Base Score: 7.3

Threat Score: 4.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2025-22839

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:25.04, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:intel-microcode

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 11/10/2025

Vulnerability Publication Date: 8/12/2025

Reference Information

CVE: CVE-2025-20053, CVE-2025-20109, CVE-2025-21090, CVE-2025-22839, CVE-2025-22840, CVE-2025-22889, CVE-2025-24305, CVE-2025-26403, CVE-2025-32086

USN: 7866-1